%0 Journal Article %T PubMed is Slightly More Sensitive but More Time Intensive to Search than Ovid MEDLINE. A Review of: Katchamart, W., Faulkner, A., Feldman, B., Tomlinson, G., & Bombardier, C. (2011). PubMed had a higher sensitivity than Ovid-MEDLINE in the search for systematic reviews. Journal of Clinical Epidemiology, 64(7), 805-807. doi:10.1016/j.jclinepi.2010.06.004 %A Cari Merkley %J Evidence Based Library and Information Practice %D 2011 %I University of Alberta %X Objective ¡ª To compare the results of searching the MEDLINE database through Ovid and the free online version of PubMed administered by the National Library of Medicine for randomized controlled trials on the subject of the drug methotrexate (MTX) for patients suffering from rheumatoid arthritis. Design ¡ª Comparative analysis of search results. Setting ¡ª Searches conducted by researchers affiliated with Mahidol University in Bangkok, Thailand, and the University of Toronto and the University Health Network in Toronto, Ontario. Subjects ¡ª A total of 3966 search results obtained from Ovid MEDLINE and PubMed. Methods ¡ª This study employs an Ovid MEDLINE search strategy originally created for a published systematic review that identified randomized controlled trials on MTX and rheumatoid arthritis (Katchamart, Trudeau, Phumethum, & Bombardier, 2009). Two of the authors of the original systematic review (Katchamart and Bombardier) are among the authors of this current study.Appropriate medical subject heading (MeSH) terms and their synonyms were identified for the three main concepts (rheumatoid arthritis, MTX, and randomized controlled trials). The search was performed in Ovid MEDLINE, seeking articles in any language that met the terms using the Boolean operator OR. The searches for the three concepts were finally combined using AND. The Ovid MEDLINE search was then translated for use in PubMed by an information professional. The formatting and terminology used in some of the original Ovid MEDLINE search statements had to be changed so they would work in the new database environment, but the researchers tried to ensure that the two searches were as similar as possible. The translated search was then executed in PubMed.The final results, as well as the number of articles retrieved for each key search concept (rheumatoid arthritis, MTX, and randomized controlled trials), were then compared. The final results were further analyzed for measures of sensitivity, precision, and number needed to read. Sensitivity is calculated by the number of eligible studies found in a database divided by the ¡°total number of eligible studies in the review¡± multiplied by 100 (Katchamart, Faulkner, Feldman, Tomlinson, & Bombardier, p. 806). Eligible studies were identified using the inclusion/exclusion criteria developed by Katchamart et al. The figure for ¡°total number of eligible studies in the review¡± is taken from that same study, which forms the ¡°gold standard¡± for this analysis (Katchamart et al., p. 806). Precision is calculated by dividing the total number of eligible cita %K Pubmed %K Ovid Medline %K Database Searching %U http://ejournals.library.ualberta.ca/index.php/EBLIP/article/download/9981/8151